Kinetics investigations for holographic Bragg grating based on polymer dispersed liquid crystal  

作　　者：郑致刚 宋静 张伶莉 刘永刚 郭福忠 马骥 李文萃 邓舒鹏 宣丽 

机构地区：[1]State Key Laboratory of Applied Optics,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences [2]Graduate School of Chinese Academy of Sciences [3]Materials Sciences and Engineering School,Changchun University of Science and Technology [4]SVA Optronics Co.Ltd

出　　处：《Chinese Physics B》2008年第9期3227-3235,共9页中国物理B（英文版）

基　　金：supported by Natural Science Foundation of China (Grants Nos 60578035 and 50473040);Science Foundation of Jilin Province,China (Grant Nos 20050520 and 20050321-2)

摘　　要：This paper investigates the monomer kinetics of polymer dispersed liquid crystal （PDLC） grating. Fourier transform infrared （FTIR） spectra are used in the studies of photoreaction kinetics. The results indicate that there is a relative stable stage arises after a very short initial stage. Based on FTIR studies, the monomer diffusion equation is deduced and necessary numerical simulations are carried out to analyse the monomer conversion which is an important point to improve phase separation structure of PDLC grating. Some simulation results have a good agreement with experimental data. In addition, the effects induced by monomer diffusion constant D and diffusion-polymerization-ratio rate R are discussed. Results show that monomer conversion can be improved by increasing value of D. Besides, a good equilibrium state （R = 1） is more beneficial to the diffusion of monomer which is important in the process of phase separation.This paper investigates the monomer kinetics of polymer dispersed liquid crystal （PDLC） grating. Fourier transform infrared （FTIR） spectra are used in the studies of photoreaction kinetics. The results indicate that there is a relative stable stage arises after a very short initial stage. Based on FTIR studies, the monomer diffusion equation is deduced and necessary numerical simulations are carried out to analyse the monomer conversion which is an important point to improve phase separation structure of PDLC grating. Some simulation results have a good agreement with experimental data. In addition, the effects induced by monomer diffusion constant D and diffusion-polymerization-ratio rate R are discussed. Results show that monomer conversion can be improved by increasing value of D. Besides, a good equilibrium state （R = 1） is more beneficial to the diffusion of monomer which is important in the process of phase separation.

关 键 词：polymer dispersed liquid crystal diffusion kinetics Bragg grating 

分 类 号：O438.1[机械工程—光学工程]